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Understand different integration results with practically the same input?

GROUPS:

Hi folks, Im new, so Im not sure this is the right place to drop my question.

In[1]:   Integrate[Exp[-10 x]/(1 - (9/10) Exp[-10 x])^2, {x, 0, Infinity}]
Out[1]: 1

In[2]:   Integrate[Exp[-10 x]/(1 - 0.9 Exp[-10 x])^2, {x, 0, Infinity}]
Out[2]:   1. - 1.10218*10^-15 i

My question is why in the second output I get that if the input is practically the same as In[1] (I just changed (9/10) for 0.9)

Thanks.

POSTED BY: Fernando Santos
Answer
9 days ago

See this here1, here2,here3,here4

POSTED BY: Mariusz Iwaniuk
Answer
8 days ago

Thanks bro, I see know is a common mistake.

POSTED BY: Fernando Santos
Answer
8 days ago

Group Abstract Group Abstract